Great little game! There's a lot here to like. Its a really nice arcadey, pick up and play kinda game. The graphics are great, I really like the style you went for. The gameplay is super fast and almost puzzle like. It's fairly addictive.
There's a lot of opportunity here to expand. I would love to see random room choices, and maybe even a few animations to really bring things to life.
Honestly, great work. This is a lot of fun.